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Absorption-line-shape recovery beyond the detection-bandwidth limit: Application to the precision spectroscopic measurement of the Boltzmann constant

F. Rohart, S. Mejri, P. L. T. Sow, S. K. Tokunaga, C. Chardonnet, B. Darquié, H. Dinesan, E. Fasci, A. Castrillo, L. Gianfrani, and C. Daussy
Phys. Rev. A 90, 042506 – Published 20 October 2014

Abstract

A theoretical model of the influence of detection-bandwidth properties on observed line shapes in laser absorption spectroscopy is described. The model predicts artificial frequency shifts, extra broadenings, and line asymmetries that must be taken into account in order to obtain accurate central frequencies and other spectroscopic parameters. This reveals sources of systematic effects most probably underestimated, so far potentially affecting spectroscopic measurements. This may impact many fields of research, from atmospheric and interstellar physics to precision spectroscopic measurements devoted to metrological applications, tests of quantum electrodynamics, or other fundamental laws of nature. Our theoretical model is validated by linear absorption experiments performed on H2O and NH3 molecular lines recorded by precision laser spectroscopy in two distinct spectral regions, near- and midinfrared. Possible means of recovering original line-shape parameters or experimental conditions under which the detection bandwidth has a negligible impact, given a targeted accuracy, are proposed. Particular emphasis is put on the detection-bandwidth adjustments required to use such high-quality molecular spectra for a spectroscopic determination of the Boltzmann constant at the 1 ppm level of accuracy.

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  • Received 11 June 2014

DOI:https://doi.org/10.1103/PhysRevA.90.042506

©2014 American Physical Society

Authors & Affiliations

F. Rohart1, S. Mejri2,3, P. L. T. Sow2,3, S. K. Tokunaga3,2, C. Chardonnet2,3, B. Darquié2,3, H. Dinesan4, E. Fasci4, A. Castrillo4, L. Gianfrani4, and C. Daussy3,2,*

  • 1Laboratoire de Physique des Lasers, Atomes et Molécules, UMR CNRS 8523, Université de Lille 1, F-59655 Villeneuve d'Ascq cedex, France
  • 2CNRS, UMR 7538, Laboratoire de Physique des Lasers, F-93430 Villetaneuse, France
  • 3Université Paris 13, Sorbonne Paris Cité, Laboratoire de Physique des Lasers, F-93430 Villetaneuse, France
  • 4Dipartimento di Matematica e Fisica, Seconda Università di Napoli, Viale Lincoln 5, I-81100 Caserta, Italy

  • *Author to whom correspondence should be addressed: christophe.daussy@univ-paris13.fr

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Issue

Vol. 90, Iss. 4 — October 2014

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